CREDIT QUALITY ASSESSMENT (Summary Information on Allowance for Loan and Lease Loss Activity) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Credit Quality Assessment [Abstract]
Balance at beginning of year	$ 45,257	$ 44,067	$ 44,067
Provision for loan losses	1,997	194	2,977
Loan and lease charge-offs	(477)	(482)	(2,566)
Loan and lease recoveries	154	82	779
Net charge-offs	(323)	(400)	(1,787)
Balance at period end	$ 46,931	$ 43,861	$ 45,257